sui_getChainIdentifier - Sui

Example code for the sui_getChainIdentifier JSON-RPC method. Complete guide on how to use sui_getChainIdentifier JSON-RPC in GetBlock Web3 documentation.

This method returns the chain's genesis checkpoint digest (first four bytes as a hex string). This identifier uniquely distinguishes between SUI networks and is used for transaction signing and protection against replay attacks.

Parameters

None

Request Example

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
     "method": "sui_getChainIdentifier",
  "params": [],
  "id": "getblock.io"
    }'

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
     "method": "sui_getChainIdentifier",
  "params": [],
  "id": "getblock.io"
    });

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
     "method": "sui_getChainIdentifier",
  "params": [],
  "id": "getblock.io"
    })

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
             "method": "sui_getChainIdentifier",
              "params": [],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "result": "4c78adac"
}

Response Parameters

Parameter

Type

Description

result

string

8-character hex string representing the chain identifier

Use Cases

Network Verification: Verify connection to the correct network (Mainnet vs Testnet) before submitting transactions.
Replay Protection: Include in transaction signing to prevent cross-chain replay attacks.
Multi-Network Apps: Support multiple SUI networks with automatic detection.

Error Handling

Error Code

Description

-32602

Invalid params - malformed input

-32603

Internal error - simulation failed

MoveAbort

Move execution aborted

SDK Integration

example.ts

import { SuiClient } from '@mysten/sui/client';
const client = new SuiClient({ url: 'https://go.getblock.io/<ACCESS-TOKEN>/' });
const chainId = await client.getChainIdentifier();
console.log(chainId);

Previoussui_devInspectTransactionBlock - Sui Nextsui_getLatestCheckpointSequenceNumber - Sui

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